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Table 2 Weekly Weather Patterns and Incidence of Invasive Pneumococcal Disease in Philadelphia.

From: Let the sun shine in: effects of ultraviolet radiation on invasive pneumococcal disease risk in Philadelphia, Pennsylvania

 

Univariable Models

Multivariable Modela, b

Environmental or Meteorological Exposure

IRR

(95% CI)

P

IRR

(95% CI)

P

Cooling Degree-Days (°C)b

0.92

(0.90 - 0.94)

< 0.001

0.97

(0.94 to 1.00)

0.054

Maximum Temperature (°C)

0.97

(0.96 - 0.97)

< 0.001

1.03

(1.003 to 1.06)

0.028

Minimum Temperature (°C)

0.96

(0.95 - 0.97)

< 0.001

...

...

...

Relative Humidity (%)

0.98

(0.97 - 0.99)

0.002

...

...

...

UV Index

0.89

(0.87 - 0.92)

< 0.001

0.70

(0.54 - 0.91)

0.007

Sulphur Oxides (ppm × 100)

1.73

(1.27 - 2.37)

0.002

...

...

...

Average Wind Speed (km/h)

1.01

(1.006 - 1.015)

< 0.001

...

...

...

  1. NOTE: Incidence rate ratios (IRRs) reflect change in disease risk per unit change in the meteorological variable in question. CI, confidence interval; ppm, parts per million.
  2. aThe model was also adjusted for seasonal oscillation, cumulative cases during the prior month, calendar year and year-squared.
  3. bModel deviance statistic chi-squared = 3156 on 9317 d.f., P = 1.000.
  4. cCooling degree days are defined as the number of degrees a daily mean temperature is above 24°C. For example, a day with an average temperature of 27°C would have 3 cooling degree-days.